Mainz 2017 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 5: Precision Measurements and Metrology: Gravity
Q 5.3: Talk
Monday, March 6, 2017, 15:15–15:30, P 104
Deep Frequency Modulation Interferometry — •Christoph Vorndamme1, Oliver Gerberding2, Katharina-Sophie Isleif1, Thomas S. Schwarze1, Moritz Mehmet2, Gerhard Heinzel2, and Karsten Danzmann1,2 — 1Albert Einstein Institute, Leibniz Universität Hannover — 2Max Planck Institute for Gravitational Physics (Albert Einstein Institute)
Here we present the latest developments for the deep frequency modulation interferometry (DFMI) technique at the AEI. This technique is based on a Michelson setup with unequal armlength and a strong, or deep, frequency modulation applied to the input laser. The unequal armlength converts the laser frequency modulation into an effective deep phase modulation in the measurement arm, thus encoding the measurement phase in complex amplitudes of the modulation frequency harmonics. Unlike in a phase modulated setup, which already provides high precision and high dynamic range, the frequency modulated setup can be implemented with very compact optical heads for a scalable amount of degrees of freedom. This is due to the laser frequency modulation and reference noise measurement being kept seperate from the part of the optics that need high thermal and mechanical stability. Futhermore, the effective modulation depth includes the total delay in the measurement arm, thus yielding the possibility for absolute ranging. The presented efforts include the construction of optical hardware like a glued ultra-stable reference interferometer as well as the developement of fast phase readout electronics (phasemeter) based on a system on chip (SoC).